For some platforms, they don’t allow custom players, so we’re unable to use mpv or any other player (other than the native one) on those platforms. We already use mpv for Plex Media Player, and the only other platform we’d potentially be able to look at is Android, however mpv on Android doesn’t have audio passthrough, which would be a regression from our current ExoPlayer2 player on Android (both of which are based on libva anyway). So in summary, not at the moment 
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